chore(release): update changelog and bump version 0.21.0 (#356)

Author: jawid-h

CHANGELOG.md

@@ -1,3 +1,29 @@
+# [0.21.0](https://github.com/dashevo/js-dpp/compare/v0.20.0...v0.21.0) (2021-10-12)
+
+
+### Features
+
+* introduce consensus error codes ([#341](https://github.com/dashevo/js-dpp/issues/341), [#342](https://github.com/dashevo/js-dpp/issues/342))
+* split validation logic into basic, signature, fee and state ([#331](https://github.com/dashevo/js-dpp/issues/331))
+* protocol versioning updates ([#325](https://github.com/dashevo/js-dpp/issues/325), [#326](https://github.com/dashevo/js-dpp/issues/326), [#329](https://github.com/dashevo/js-dpp/issues/329), [#330](https://github.com/dashevo/js-dpp/issues/330), [#336](https://github.com/dashevo/js-dpp/issues/336), [#337](https://github.com/dashevo/js-dpp/issues/337), [#344](https://github.com/dashevo/js-dpp/issues/344), [#346](https://github.com/dashevo/js-dpp/issues/346), [#349](https://github.com/dashevo/js-dpp/issues/349), [#351](https://github.com/dashevo/js-dpp/issues/351))
+* removed verify SML flag triggers ([#324](https://github.com/dashevo/js-dpp/issues/324))
+
+
+### Bug Fixes
+
+* building indices on arrays using `prefixItems` ([#343](https://github.com/dashevo/js-dpp/issues/343))
+
+
+### BREAKING CHANGES
+
+* `stateTransition.validateStructure` renamed to `stateTransition.validateBasic` and doesn't perfom signature validation
+* `stateTransition.validateData` renamed to `stateTransition.validateState`
+* validation errors are changed
+* removed old data triggers
+* old serialized data is not compatible
+
+
+
 # [0.20.0](https://github.com/dashevo/js-dpp/compare/v0.19.2...v0.20.0) (2021-07-08)